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epinion from scientific point of viewMar 24 '03 Write an essay on this topic.
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The Bottom Line Occasional use of additives is a much less expensive way to maintain engine cleanliness than regular use of premium gasoline.
Hello all, I am a student concentrating in molecular physics at MIT: Here is my approach DI is a measure of the gasoline's total volatility, or tendency to vaporize completely. A high DI number is less volatile than a low DI number. Most premium gasoline sold in the U.S. has a higher (worse) DI index than regular or mid-grade gasoline. Use of premium gasoline is NOT recommended for vehicles designed to run on 87 (R M)/2 regular or 89 (R M)/2 mid-grade gasoline. High DI gasoline also causes higher emissions for the same reasons it causes driveability problems. For vehicles that require an octane rating of 91 (R M)/2, premium is recommended, or possibly required. Using premium fuel with a higher than recommended octane rating not recommended. Owners who experience fuel related cold start and warm up driveability problems should try a gasoline with the recommended octane rating or different brands of gasoline until they find one that provides good performance. The octane quality of gasoline is only a measure of its resistance to spark knock. The use of higher than recommended octane gasoline under normal operating conditions does NOT improve start ability, idle quality, fuel economy, driveability, acceleration, engine durability, or emissions. In fact, most higher octane gasoline available in the U.S. has a higher DI value than regular gasoline. Customers are most likely to experience poor driveability with premium gasoline than with regular. Some vehicles, such as Viper, Prowler, 5.9L Grand Cherokee, 2.0L Turbo Talon, and 2.0L DOHC Neon have been specifically designed to take advantage of higher octane. These vehicles may have higher compression ratios, and/or more aggressive spark calibrations which provide optimum performance with the specified higher octane. However, other vehicles which are not specifically designed and calibrated to take advantage of higher octane will not benefit from higher octane. Some vehicles may experience light spark knock in situations such as trailer towing or climbing steep sustained grades. Light knock or "ping" under these conditions is not harmful. However, if the customer is concerned about light knock under these circumstances, the use of 89 (R M)/2 or even 91 (R M)/2 premium gasoline may be temporarily warranted. If a vehicle is experiencing heavy spark knock on gasoline with its designed octane rating, this may be an indication of excessive combustion chamber deposits, or some other problem. Combustion chamber deposits can be removed with regular additives available under different brands. These additives are extremely easy to produce yourself too. Some gasoline marketers may advertise that their premium gasoline contains extra detergent additives. Under provisions of the Clean Air Act, ALL gasoline sold in the U.S. must contain effective deposit control additives.  |
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